Re: [PATCH] cxl: core/region - ignore interleave granularity when ways=1

[Dave Jiang]

On 4/2/25 12:34 PM, Gregory Price wrote:
> When validating decoder IW/IG when setting up regions, the granularity
> is irrelevant when iw=1 - all accesses will always route to the only
> target anyway - so all ig values are "correct". Loosen the requirement
> that `ig = (parent_iw * parent_ig)` when iw=1.
> 
> Signed-off-by: Gregory Price <gourry@xxxxxxxxxx>

Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
> ---
>  drivers/cxl/core/region.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index 04bc6cad092c..dec262eadf9a 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -1553,7 +1553,7 @@ static int cxl_port_setup_targets(struct cxl_port *port,
>  
>  	if (test_bit(CXL_REGION_F_AUTO, &cxlr->flags)) {
>  		if (cxld->interleave_ways != iw ||
> -		    cxld->interleave_granularity != ig ||
> +		    (iw > 1 && cxld->interleave_granularity != ig) ||
>  		    cxled->spa_range.start != p->res->start ||
>  		    cxled->spa_range.end != p->res->end ||
>  		    ((cxld->flags & CXL_DECODER_F_ENABLE) == 0)) {